I googled for you and found this:
Singing Wine Glasses - sciencebuddies.org
You'd probably have to try out different tones, but I also found this:
Most glasses are not tuned to true pitch. For instance, a glass which might sound like a Tenor C# or 550 hertz might be slightly higher (550.3 hertz) or lower (549.9 hertz).
Most mid-tone speakers will do the 500Hz range, but I'd recommend trying this out in something like Adobe Audition where you could make a sound file with several frequencies and measure results.
I'm not sure but recording you tapping the glass should give you a somewhat accurate range of frequencies to try.
Also I should note that you need a precise match between frequency and volume, so it will likely take a huge amount of time.
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